216862417 has 2 divisors, whose sum is σ = 216862418. Its totient is φ = 216862416.

The previous prime is 216862361. The next prime is 216862433. The reversal of 216862417 is 714268612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190329616 + 26532801 = 13796^2 + 5151^2 .

It is a cyclic number.

It is not a de Polignac number, because 216862417 - 2¹⁵ = 216829649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216862517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108431208 + 108431209.

It is an arithmetic number, because the mean of its divisors is an integer number (108431209).

Almost surely, 2^216862417 is an apocalyptic number.

It is an amenable number.

216862417 is a deficient number, since it is larger than the sum of its proper divisors (1).

216862417 is an equidigital number, since it uses as much as digits as its factorization.

216862417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 37.

The square root of 216862417 is about 14726.2492509125. The cubic root of 216862417 is about 600.7974738488.

The spelling of 216862417 in words is "two hundred sixteen million, eight hundred sixty-two thousand, four hundred seventeen".